class Settings():

    def __init__(self):
        #屏幕设置
        self.screen_width=1200
        self.screen_height=800
        self.bg_color=(230,230,230)
        #设置飞船

        self.ship_limit = 3
        #子弹设置

        self.bullet_width=3
        self.bullet_height=15
        self.bullet_color=60,60,60
        self.bullets_allowed=3
        #外星人设置

        self.fleet_drop_speed= 10

        #以什么样的速度加快游戏节奏
        self.speedup_scale = 1.1

        #外星人点数的提高速度
        self.score_scale = 1.5


        self.initialize_dynamic_settings()

    def initialize_dynamic_settings(self):
        #初始随游戏进行而变化的设置
        self.ship_speed_factor = 1.5
        self.bullet_speed_factor = 3
        self.alien_speed_factor = 1
        #fleet_direction为1表示向右移，为-1表示向左移
        self.fleet_direction=1
        self.alien_points = 50


    def increase_speed(self):
        #提高速度设置
        self.ship_speed_factor *= self.speedup_scale
        self.bullet_speed_factor *= self.speedup_scale
        self.alien_speed_factor *= self.speedup_scale
        # 计分
        self.alien_points = int(self.alien_points * self.score_scale)


